KR20060054916A - Indexable type cutting tool - Google Patents

Abstract

The holder is connected to the coolant device of the machine tool and is supplied with the coolant groove for dispensing the coolant to the outside. The holder is mounted on the holder to perform cutting, and the coolant inside the holder is supplied during the cutting operation. Disclosed is an indexable type cutting tool capable of improving processing accuracy, surface roughness, and high cutting capability by providing an insert having a second coolant groove portion to be injected to the outside. The indexable type cutting tool according to the present invention is connected to a conventional coolant device or a conventional MQL device provided in a conventional machine tool so as to guide the coolant along the inside of the holder on the other end of the holder. The first coolant guide groove and the second coolant guide are respectively formed on the upper surface of the sheet and the lower surface of the sheet so as to communicate with the coolant guide hole. A first cooler portion having a groove and a first coolant injection groove is formed.

Description

Indexable type cutting tool

1 is an exploded view showing an indexable type cutting tool according to the present invention;

FIG. 2 is an enlarged perspective view of the cutting insert shown in FIG. 1;

3 is a cross-sectional view taken along line A-A of FIG. 1,

4 is a perspective view illustrating another embodiment of the first coolant guide groove and the second coolant guide groove shown in FIG. 1;

5 is a perspective view illustrating another embodiment of the third coolant guide groove and the fourth coolant guide groove shown in FIG. 1;

FIG. 6 is a perspective view illustrating still another embodiment of the first coolant guide groove and the second coolant guide groove shown in FIG. 1;

FIG. 7 is a perspective view illustrating still another embodiment of the third coolant guide groove and the fourth coolant guide groove shown in FIG. 1;

8 is a view showing a ball end mill according to the prior art, and

FIG. 9 is a cross-sectional view taken along the line A-A of FIG. 8.

Explanation of symbols on the main parts of the drawing

100: indexable type cutting tool 200: holder

210: insert sheet 230: first coolant

232: Coolant Guide 234: The first Coolant Guide

236: second coolant guide groove 238: first coolant injection groove

300: cutting insert 330: second coolant

332: third coolant guide home 334: fourth coolant guide home

336: second coolant injection groove 400: fastening screw

The present invention relates to an indexable type cutting tool, and more particularly, a holder formed with a first coolant groove which is connected to a coolant device of a machine tool and receives coolant and sprays it to the outside. In order to improve machining accuracy, surface roughness, and high depth of cut, the insert is provided in the holder and has an insert formed with a second coolant groove that receives the coolant inside the holder and sprays it to the outside during cutting. The present invention relates to an indexable type cutting tool.

In general, a cutting tool is mainly used for cutting ferrous and nonferrous metals, and is generally a tool that is mounted on a machine tool and performs cutting to process a workpiece into a desired shape. This cutting tool consists of a cutting insert with a cutting edge and a holder for holding the cutting insert. In addition, the cutting tool can be divided into brazing type and indexable type according to the method of fixing the cutting insert to the holder. The brazing type permanently fixes the cutting insert by brazing welding to a part of the holder. In the indexable type, the cutting insert is attached to and detached from the holder using a fixing device provided in the holder.

On the other hand, as a method of cutting metal using a cutting tool, first, a method of performing cutting by contacting a pickled portion of a cutting tool with a rotating metal workpiece, and secondly, a tool having a cutting edge, that is, a cutting insert After fixing to the machine tool using a holder for the tool, there is a method of processing the workpiece to the desired shape by contacting the workpiece to be fixed in advance while rotating the cutting tool under such a state.

The second method of the above cutting method is used to cut molds or spherical parts consisting mainly of steel (carbon steel, alloy steel, and mold steel). In this process, high precision machining is usually required as a finishing process. The cutting load, which is a feature of the shape machining, is very large, and since it is accompanied by unmanned and high speed machining, a cutting tool having high accuracy, high rigidity and stability is required.

By the way, when the cutting tool of the indexable type is used in the cutting process, when the cutting edge of the insert is worn out and the end of the service life, there is an advantage that can be replaced by a new insert, while the fixing device is incomplete Problems can arise when inserting, removing and cutting inserts.

Therefore, the conditions that the indexable cutting tool should have are as follows.

First, in consideration of the functional aspect, when an incomplete fixing device is used, the insert may be inserted into the holder, and then the precision of the workpiece may not be precisely set due to the mismatch between the holder and the insert center. In addition, when the fixing force is weak, serious problems such as the insert protruding and breaking due to the cutting load at the time of cutting, and over cutting of the workpiece occurs. Therefore, the development of high precision, high rigidity, high efficiency fixing device is needed.

Next, considering the economic aspect, since the insert and the body must be manufactured according to the fixing device, their shape is complicated and the manufacturability may be reduced, and the parts unnecessary for the cutting process must be manufactured to fix the cutting tool. As a result, production costs can rise, resulting in lower economic efficiency. Therefore, there is a need for the development of a fastening device having a simple structure and easy to manufacture and capable of sufficiently performing a fastening function of a cutting tool.

Finally, it should be easy to insert and remove the insert and replace it quickly.

8 is a view showing a ball end mill according to the prior art, and FIG. 9 is a cross-sectional view taken along the line A-A of FIG.

8 and 9, the conventional ball end mill 10 is inserted into the holder 20, the insert seat 22 is formed in the front end portion, the insert seat 22 is cut by the fastening screw 40 is mounted An insert 30 is provided.

In this case, the first guide hole 24 extends from the end of the holder 20 to the insert sheet 22 so that the coolant can be guided to the cutting part during the cutting process. On the upper surface and the lower surface of 22, a second guide hole 26 connected to the first guide hole 24 and guiding the coolant to the cutting portion is divided in the first guide hole 24 to insert the insert 22. Is formed up to the extended end of the. Also. Third guide holes 32 corresponding to the second guide holes 26 are formed on the upper and lower surfaces of the cutting insert 30 to guide the coolant together with the second guide holes 26 to the cutting portion.

However, the above-described ball end mill 10 has a problem in that the coolant can be smoothly supplied to the entire cutting part because the coolant has a structure that can only be guided locally to the cutting part. As a result, cutting performance was lowered, making high speed and high efficiency machining difficult.

The present invention has been made to solve the above-mentioned conventional problems, the object of the present invention is connected to the coolant device of the machine tool holder is provided with a first coolant groove is supplied to the coolant and sprayed to the outside, Machining accuracy, surface roughness and high cutting depth are provided by inserts mounted on the holder to perform cutting, and formed with second coolant grooves that receive coolant inside the holder and spray it to the outside during cutting. Machining ability can be improved.

In order to achieve the object of the present invention as described above, the present invention,

Insert sheet and insert sheet extending from one side to the other side and having a sheet upper surface, a sheet lower surface and an inner surface of the sheet, and one side and the other side of the sheet upper surface and the lower surface of the sheet are formed to face each other, respectively. The holder has a first fastening hole formed perpendicularly to the radially outer side of the sheet, and has an insert-adhering surface and an insert upper surface and an insert lower surface which are in close contact with the inner surface of the sheet, and the insert upper surface and the insert lower surface are opposite to each other. A cutting insert which is formed and inserted into the insert sheet and has a second fastening hole communicating with the first fastening hole at a central portion thereof, and a fastening that strongly fastens the cutting insert to the insert seat while being fastened to the first fastening hole and the second fastening hole. In the indexable type cutting tool provided with a screw,

The holder is connected to a conventional coolant device or a conventional MQL device provided in a conventional machine tool, and extends along the inside of the holder to the inner side of the seat of the insert sheet so as to guide the coolant. The first coolant guide groove, the second coolant guide groove, and the first coolant injection groove are respectively formed on the upper and lower seat surfaces so as to be in communication with the ball and the coolant guide hole to inject the coolant to the entire cutting area. It provides an indexable type cutting tool having a first cooler portion having.

As described above, according to the present invention, and connected to the coolant device of the machine tool, the holder is provided with a first coolant groove portion for receiving the coolant and spraying to the outside, and is mounted to the holder to perform cutting By providing an insert with a second coolant groove that receives coolant inside the holder and sprays it to the outside during cutting, the machining accuracy, surface roughness, and high cutting performance can be improved.

Hereinafter, an indexable type cutting tool according to an exemplary embodiment of the present invention will be described with reference to the accompanying drawings.

1 is an exploded view showing an indexable type cutting tool according to the present invention, FIG. 2 is an enlarged perspective view of the cutting insert shown in FIG. 1, and FIG. 3 is shown along the line AA of FIG. 1. It is a cross section.

1 to 3, the indexable type cutting tool 100 according to the present invention is formed with an insert sheet 210 extending from one end side to the other end side and perpendicular to the radially outer side of the insert sheet 210. 1 The holder 200 in which the fastening hole 220 is formed, the insert upper surface 310a and the insert lower surface 310b are formed so that the pickled 312a and 312b and the non-pickled 314a and 314b are formed to face each other. The cutting insert 300 inserted into the seat 210 and having a second fastening hole 320 communicating with the first fastening hole 220 at the center portion thereof, the first fastening hole 220 and the second fastening hole ( It is provided with a fastening screw 400 for fastening the cutting insert 300 to the insert seat 210 while being fastened to the 320.

In this case, the holder 200 is connected to a normal coolant device (not shown) or a conventional MQL device (not shown) provided in a general machine tool, and a first coolant unit 230 for guiding the coolant is provided. The cutting insert 300 is formed with a second coolant portion 330 which is connected to the first coolant portion 230 and similarly guides the coolant and injects coolant to the entire cut portion.

The first coolant 230 provided in the holder 200 includes a coolant guide hole 232, a first coolant guide groove 234, and a second coolant guide groove 236. The coolant guide hole 232 extends along the inside of the holder 200 on the other end surface of the holder 200 to the sheet inner side surface 212 of the insert sheet 210. The coolant guide hole 232 formed as described above is communicatively connected to the first coolant guide groove 234 and the second coolant guide groove 236.

The first coolant guide groove 234 and the second coolant guide groove 236 are formed on the sheet upper surface 214a and the sheet lower surface 214b of the insert sheet 210, respectively. At this time, the sheet upper surface 214a and the lower sheet surface 214b face each other so that the picked contact surfaces 216a and 216b and the cutting inserts which closely contact the pickles 312a and 312b of the cutting insert 300 are opposed to each other. Uncut cutting surfaces 218a and 218b are formed in which the cuttables 314a and 314b of 300 closely contact each other.

The first coolant guide groove 234 is formed on the seat upper surface 214a and the seat lower surface 214b from the sheet inner side surface 212 of the insert sheet 210 to be in communication with the coolant guide hole 232. An annular shape to one end of each non-cutting contact surface (218a, 218b) along each of the pickling contact surfaces (216a, 216b) spaced apart from the first fastening hole (220) around the first fastening hole (220) formed And the second coolant guide groove 236 is similarly formed on the seat upper surface 214a and the seat lower surface 214b from the sheet inner side surface 212 so as to be in communication with the coolant guide hole 232. It extends in the annular shape to the other end of the non-cutting contact surfaces 218a and 218b along the non-cutting contact surfaces 218a and 218b so as to be spaced apart from the first fastening hole 220 about the first fastening hole 220. . At this time, each of the first coolant guide grooves 234 is formed with a plurality of first coolant injection grooves 238 extending to the end side of each of the cutting contact surfaces (216a, 216b) are spaced at equal intervals.

At this time, two or more first coolant injection grooves 238 are formed at end portions of the close contact surfaces 216a and 216b so that the coolant can be guided to the entire cutting portion. Preferably, each of the first coolant injection grooves 238 has the same width as each other. More preferably, each of the first coolant injection grooves 238 may be formed to have a different width. In addition, the first coolant guide groove 234, the second coolant guide groove 236, and the first coolant injection groove 238 may be formed only on any one of the upper sheet 214a and the lower sheet 214b. Can be.

On the other hand, the first coolant 230 is the auxiliary coolant that extends to both ends of the seat inner side surface 212 while the center portion is in communication with the coolant guide hole 232 at each corner portion of the seat inner side surface 212 The groove 240 is further provided. The cutting insert 300 is mounted on the holder 200 formed as described above.

The second coolant portion 330 formed on the insert upper surface 310a and the insert lower surface 310b of the cutting insert 300 faces the third coolant guide groove 234 while facing the first coolant guide groove 234. A groove 332 and a fourth coolant guide groove 334 facing and corresponding to the second coolant guide groove 236 are provided.

The third coolant guide groove 332 is the insert upper surface 310a and the insert lower surface 310b from the insert contact surface 316 which is in close contact with the seat inner surface 212 so as to communicate with the coolant guide hole 232. Along the second fastening hole 320 formed at the center of the second fastening hole 320 is spaced along the respective pickles (312a, 312b) to the end of each of the non-pickled (314a, 314b) in an annular shape In the same manner, the fourth coolant guide groove 334 has a second fastening formed in the insert contact surface 316 to the insert upper surface 310a and the insert lower surface 310b so as to communicate with the coolant guide hole 232. It is extended in an annular shape to the other end of each of the non-pickled 314a and 314b so as to be spaced apart from the second fastening hole 320 about the ball 320. At this time, each of the third coolant injection grooves 332 extends toward the end portions of the pickles 312a and 312b and faces the second coolant injection grooves 238 while facing the second coolant injection grooves 336. ) Are spaced apart at equal intervals.

At this time, two or more second coolant injection grooves 336 are formed toward the end portions of the pickles 312a and 312b so that the coolant can be guided to the entire cutting portion. Preferably, each of the second coolant injection grooves 336 has the same width as each other. More preferably, each of the second coolant injection grooves 336 may be formed to have a different width. In addition, the third coolant guide groove 332, the fourth coolant guide groove 334, and the second coolant injection groove 336 may be formed on only one of the insert upper surface 310a or the insert lower surface 310b. Can be.

On the other hand, the center portion of the insert contact surface 316 facing the coolant guide hole 232 temporarily cools the coolant guided by the coolant guide hole 232, each of the first coolant guide groove 234 ), The second coolant guide groove 236, the third coolant guide groove 332, and the fourth coolant guide groove 334 so that the distribution groove 318 concave toward the second fastening hole 320 can be guided evenly. ) Is formed.

4 is a perspective view illustrating another embodiment of the first coolant guide groove and the second coolant guide groove shown in FIG. 1, and FIG. 5 is a third coolant guide groove and the fourth coolant shown in FIG. 1. A perspective view showing another embodiment of the guide groove.

Referring to FIGS. 4 and 5, the first coolant guide groove 234 may be connected to the coolant guide hole 232 from the sheet inner side surface 212 and the sheet upper surface 214a and the sheet lower surface ( 214b extends adjacent to the ends of each of the pickled contact surfaces 216a and 216b, and likewise the second coolant guide groove 236 can communicate with the coolant guide hole 232 ) Extends along the sheet upper surface 214a and the sheet lower surface 214b to the end side of each of the non-cut contact surfaces 218a and 218b. At this time, the first coolant guide groove 234 is formed with a plurality of first coolant injection grooves 238 extending to the end side of each of the cutting contact surfaces (216a, 216b) irregularly spaced. That is, the first coolant guide groove 234, the second coolant guide groove 236, and the plurality of first coolant injection grooves 238 have a branch shape that does not interfere with the first fastening hole 220. .

On the other hand, the third coolant guide groove 332 is the insert upper surface 310a and the insert lower surface from the insert contact surface 316 in close contact with the seat inner side surface 212 to be in communication with the coolant guide hole 232 It extends adjacent to the ends of each of the pickles (312a, 312b) along the (310b), and similarly the fourth coolant guide groove 334 can be in communication with the coolant guide hole (232) It extends from the end side of each non-pickle 314a, 314b. At this time, the second coolant injection groove 336 facing the first coolant injection groove 238 while extending to the end portions of the respective pickles 312a and 312b is provided in the third coolant guide groove 332. It is formed irregularly. That is, the third coolant guide groove 332, the fourth coolant guide groove 334, and the plurality of second coolant injection grooves 336 have a branch shape that does not interfere with the second fastening hole 320. .

FIG. 6 is a perspective view illustrating another embodiment of the first coolant guide groove and the second coolant guide groove shown in FIG. 1, and FIG. 7 is a third coolant guide groove and the fourth cool shown in FIG. 1. 4 is a perspective view showing another embodiment of the runt guide groove.

6 and 7, the first coolant guide groove 234 may be connected to the coolant guide hole 232 from the sheet inner side surface 212 to the upper seat surface 214a and the lower seat surface 214b. ) Extends with a gently curved curve to the ends of the respective cut-off surfaces 216a and 216b. In this case, a plurality of first coolant guide grooves 234 is formed. Preferably, at least two first coolant guide grooves 234 are formed at the end portions of the cutting contact surfaces 216a and 216b so that the coolant can be guided to the entire cutting portion. Similarly, the second coolant guide groove 236 may be in close contact with each other along the seat upper surface 214a and the seat lower surface 214b from the seat inner side surface 212 to communicate with the coolant guide hole 232. It extends with a gently curved curve to the ends of faces 218a and 218b.

On the other hand, the third coolant guide groove 332 is the insert upper surface (310a) and the insert lower surface from the insert contact surface 316 is in close contact with the seat inner surface 212 to be in communication with the coolant guide hole 232 Along the 310b, each of the pickles 312a and 312b extends with a gently curved curve, and the fourth coolant guide groove 334 is in close contact with the insert so as to be in communication with the coolant guide hole 232. It extends from the surface 316 to the ends of the respective non-pickled 314a, 314b along the insert top surface 310a and the insert bottom surface 310b.

Hereinafter, the state of use of the indexable type cutting tool 100 formed as described above will be briefly described.

First, the cutting insert 300 is fastened into the insert sheet 210 by using the fastening screw 400 under the state in which the cutting insert 300 is inserted into the insert sheet 210 of the holder 200. At this time, the fastening screw 400 is fastened while passing through the first fastening hole 220 and the second fastening hole 320.

When the cutting insert 300 is fastened to the holder 200 in this way, a coolant device (not shown) or a conventional MQL device (not shown) in which the cutting tool 100 according to the present invention is mounted on a conventional machine tool. After cutting, the cutting operation is performed. When the cutting operation is performed, the coolant supplied from the coolant device is guided to the sheet inner side surface 212 and the insert contact surface 316 through the coolant guide hole 232 formed in the holder 200, and the sheet inner side surface ( 212) and the coolant guided to the insert contact surface 132 may face the first coolant guide groove 234 and the third coolant guide groove 332 and the second coolant guide groove 236 and the fourth cool. Guided to the runt guide groove 334 side. At this time, the coolant guided to the first coolant guide groove 234 and the third coolant guide groove 332 side again faces the first coolant injection groove 238 and the second coolant injection groove 336 facing each other. It is sprayed to the outside of each pickling (312a, 312b) performing a cutting operation.

In the detailed description of the present invention, the ball end mill has been described based on the indexable type cutting tool 100. However, the present invention may be applicable to an indexable type cutting tool 100 such as a drill.

As described above, the indexable type cutting tool 100 according to the present invention is formed on the coolant guide hole 232, the sheet upper surface 214a and the sheet lower surface 214b of the insert sheet 210. Mounted to a holder 200 having a first coolant guide groove 234, a second coolant guide groove 236, and a first coolant injection groove 238, and an insert seat 210 of the holder 200; Third coolant facing the first coolant guide groove 234, the second coolant guide groove 236, and the first coolant injection groove 238 on the insert upper surface 310a and the insert lower surface 310b. By having a cutting insert 300 having a runt guide groove 332, a fourth coolant guide groove 334, and a second coolant injection groove 336, each of the pickles (2) 312a, 312b) can be sprayed as a whole can not only improve the cutting performance of the cutting insert 300, but also has the advantage of high speed and high efficiency.

Although the above has been described with reference to a preferred embodiment of the present invention, those skilled in the art can variously modify and change the present invention without departing from the spirit and scope of the invention described in the claims. You will understand.

Claims (20)

An insert sheet extending from one side to the other end surface and having a sheet upper surface, a sheet lower surface, and an inner surface of the sheet, wherein one side and the other side of the sheet upper surface and the lower surface of the sheet are formed with opposing cut surfaces and non-cut adhesive surfaces, respectively; A radially outer side of the insert sheet has a holder in which a first fastening hole is formed vertically, an insert contact surface in close contact with the inner surface of the insert, an insert upper surface and an insert lower surface, and the insert upper surface and the insert lower surface facing each other. The cutting insert is inserted into the insert sheet while being pickled and non-pickled, and the center part has a cutting insert having a second fastening hole communicating with the first fastening hole, and through-fastening the first fastening hole and the second fastening hole. Indexable cutting tool with fastening screw for fastening cutting insert to the insert seat In, The holder is connected to a conventional coolant device or a conventional MQL device provided in a conventional machine tool, and along the inside of the holder to the inner surface of the insert sheet along the inside of the holder to guide the coolant. A first coolant guide groove and a second coolant guide groove formed on the sheet upper surface and the sheet lower surface so as to communicate with the coolant guide hole and the coolant guide hole to extend the coolant to the entire cutting area; And an indexable type cutting tool comprising a first coolant having a first coolant injection groove. The method of claim 1, wherein the first coolant guide groove, the second coolant guide groove, and the first coolant injection groove are not formed on the upper and lower seat surfaces of the first coolant portion. A second coolant portion having a third coolant guide groove, a fourth coolant guide groove, and a second coolant injection groove are formed on the insert upper surface and the insert lower surface of the cutting insert. Indexable type cutting tool, characterized in that. 3. The holder of claim 1 or 2, wherein the holder has a first coolant portion having the coolant guide hole, the first coolant guide groove, the second coolant guide groove, and the first coolant injection groove. The cutting insert may include the first coolant guide groove, the second coolant guide groove, the third coolant guide groove facing the first coolant injection groove, and the fourth coolant guide groove. An indexable type cutting tool, characterized in that the second coolant injection groove is formed. 4. The method of claim 3, wherein the first coolant guide groove is formed around the first fastening hole formed on the seat upper surface and the seat lower surface from the inner surface of the sheet so as to communicate with the coolant guide hole. 1 extending in an annular shape along one end of each of the non-cutting contact surface along each of the pickled contact surface spaced apart from the fastening hole, wherein the second coolant guide groove is in communication with the coolant guide hole. From the inner side to the other end of each of the non-cut contact surface along the non-cut contact surface to be spaced apart from the first fastening hole centering on the first fastening hole formed in the sheet upper surface and the lower sheet surface The first coolant injection groove is extended from each of the first coolant guide grooves while maintaining equal intervals toward the end of the pickled contact surface. The indexable type type cutting tool according to claim. 4. The first coolant guide groove of claim 3, wherein the first coolant guide groove is adjacent to an end of each of the cut contact surfaces along the seat upper surface and the seat lower surface so as to be in communication with the coolant guide hole. And the second coolant guide groove extends from the inner surface of the sheet toward the end of each of the non-cut adhesive surfaces along the upper and lower seat surfaces of the sheet to communicate with the coolant guide hole. And the second coolant injection groove extends at irregular intervals from each of the third coolant guide grooves toward the end of the pickled contact surface. 4. The indexable type cutting tool according to claim 3, wherein at least two first coolant injection grooves are formed at end portions of the cutting contact surfaces so that the coolant is guided to the entire cutting portion. 7. The cutting tool of claim 6, wherein the first coolant injection grooves have the same width. The cutting tool of claim 6, wherein the first coolant injection grooves have different widths. The method of claim 3, wherein the first coolant guide groove, the second coolant guide groove and the first coolant injection groove may be formed in any one of the upper surface sheet or the lower surface sheet. Indexable type cutting tool. According to claim 3, wherein the first coolant is gently curved from the inner side of the sheet to the end of the cut contact surface along the sheet upper surface and the lower surface of the sheet so as to be in communication with the coolant guide hole A plurality of first coolant guide grooves having a smoothly curved from the inner side of the sheet to the end of each of the non-cut contact surface along the sheet upper surface and the lower surface of the sheet so as to be in communication with the coolant guide hole An indexable type cutting tool, characterized in that it consists only of a second coolant guide groove extending and extending. 11. The indexable type cutting tool according to claim 10, wherein the first coolant guide groove is formed at two or more end portions of the cutting contact surface so that the coolant can be guided to the entire cutting portion. The method of claim 3, wherein the third coolant guide groove is the second fastening hole centered on the second fastening hole formed in the insert upper surface and the insert lower surface from the insert contact surface to communicate with the coolant guide hole It extends in an annular shape to each side of each of the non-pickled end along each pickling to be spaced apart from the fastening hole, the fourth coolant guide groove from the insert contact surface to communicate with the coolant guide hole The second coolant injection groove extends in an annular shape to the other side of each of the non-intercepted ends so as to be spaced apart from the second fastening hole with respect to the second fastening hole formed on the upper surface and the lower surface of the insert, and the second coolant injection grooves are respectively Indexable type cutting hole, characterized in that extending from the third coolant guide groove to each of the pickled end maintaining the equal intervals phrase. The method of claim 3, wherein the third coolant guide groove extends from the insert contact surface to the end of each of the pickling along the insert upper surface and the insert lower surface so as to be in communication with the coolant guide hole; The fourth coolant guide groove extends from the insert contact surface to the end side of each of the non-pickled portions so as to be in communication with the coolant guide hole, along the insert upper surface and the insert lower surface, and the second coolant. The injection groove is an indexable type cutting tool, characterized in that extending from the said third coolant guide groove to the end side of each pickling at irregular intervals. 4. The indexable type cutting tool according to claim 3, wherein at least two second coolant injection grooves are formed on the side of the end of the pickling so that the coolant can be guided to the entire cutting area. 15. The cutting tool of claim 14, wherein the second coolant spray grooves have the same width. 15. The cutting tool of claim 14, wherein the second coolant injection grooves have different widths. The method of claim 3, wherein the third coolant guide groove, the fourth coolant guide groove and the second coolant injection groove may be formed on only one of the insert upper surface or the insert lower surface. Indexable type cutting tool. The method of claim 3, wherein the second coolant portion has a plurality of curves that are gently curved from the insert contact surface to the end of the picking along the insert upper surface and the insert lower surface so as to be in communication with the coolant guide hole A fourth coolant guide groove having a gently curved curve from the insert contact surface to the end of the non-pickled portion along the insert upper surface and the insert lower surface so as to be in communication with the coolant guide groove; Indexable type cutting tool characterized by a coolant guide groove only. The indexable type cutting tool according to claim 18, wherein the third coolant guide groove is formed at two or more end portions of the pickled portion so that the coolant can be guided to the entire cutting portion. The method of claim 1, wherein each of the first coolant portion further comprises a secondary coolant groove extending at both ends of the inner surface of the sheet while the center portion is in communication with the coolant guide hole in each corner portion of the inner surface of the seat; Indexable type cutting tool.

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